I really saw a bunch of UFO's once, many years ago. It could have been some top secret human military antigravity ships or something, they were flying in formation but moved in ways that defied the physics of regular aircraft. I'm just saying, keep an open mind, it is a big universe and aliens are not that hard to believe exist. drakes equation is mathematical proof of the significant probability of aliens being out there. Over a long enough scale of time, they could develop technologies to get across the space in between stars and galaxies.